Mixer for the making of light concrete



Sept. 12, 1950 M. JANHUNEN MIXER FOR THE MAKING OF LIGHT CONCRETE FiledAug. 7, 1947 Patented Sept. 12, 1950 MIXER FOR THE MAKING OF LIGHTCONCRETE Matti J anhunen, Helsinki, Finland Application August '7, 1947,Serial No. 766,977 In Finland August 24, 1943 Section 1, Public Law691), August 8, 1946 Patent expires August 24, 1963 Claims. 1

My invention relates to a mixer for use in making light concrete, themixer having a drum provided with filling and discharge openings, ashaft extending within the drum, and mixing blades on the shaft.

According to my invention in a mixer as aforesaid the mixing bladesextend substantially radially from the shaft and substantially from oneend of the drum to the other in the direction of the shaft, and comprisewire netting, perforated plate or other perforated material.

In order that my invention may be clearly understood the following morespecific embodiment will now be described but merely by way of examplewith reference to the accompanying drawing in which Fig. 1 is alongitudinal section and Fi 2 is a transverse section.

In the drawing, I is the drum with a filling Opening 2 and a dischargeopening 3, and 4 is the shaft passing through the ends of the drum, themixing blades 5 being fitted on the shaft by means of cruciform carriers5 secured one at each end of the shaft. The four blades 5 extendradially from the shaft and are arranged at rightangles to each other,the blades consist of a single sheet of wire netting or networkappropriately bent and extending continuously between the blades. Theportion of the wire netting between each pair of adjacent blades is bentinwards to form a channel I which extends close to and parallel with theshaft 4. The outer edges of the blades 5 consist of metal strips 8 of U-shaped cross-section.

The arrangement is such that on rotation of the shaft 4 the blades 5rotate and raise from the bottom of the drum the mass to be mixed andthus effect a thorough mixing of the ingredicuts of the concrete. Theperforated blades 5 thus render the mixture porous. When increasedporosity is desired air is conducted through the mass in a manner knownper se.

I claim:

1. A concrete mixer for making light concrete, including the combinationof a hollow drum having an inlet port and an outlet port; a shaftrotatably supported transversely in the drum; a plurality of supportingmembers rigidly projecting radially from the shaft in spaced apartrelation; and a wire network extending inwardly toward said shaftbetween each two adjacent supporting members from the outer ends of saidsupporting members and being attached to said outer ends.

2. A concrete mixer for making light concrete, including the combinationof a hollow drum having an inlet port and an outlet port; a shaftrotatably supported transversely in the drum; a

plurality of supporting members rigidly projecting radially from theshaft in spaced apart relation; and a plurality of pieces of networkindividually extending inwardly towards said shaft between each twoadjacent supporting members from the outer ends of said supportingmembers and having the ends of said pieces of network secured to saidouter ends.

3. A concrete mixer for making light concrete, including the combinationof a hollow drum having an inlet port and an outlet port; a shaftrotatably supported transversely in the drum; a single piece of networksurrounding all of the supporting members and extending inwardly towardsaid. shaft between each twoadjacent supporting members from the outerends of said supporting members and being secured to said outer ends.

4. A concrete mixer for making light concrete, including the combinationof a hollow drum having an inlet port and an outlet port; a shaftrotatably supported transversely in the drum; a plurality of widesupporting blades rigidly projecting radially from the shaft inangularly spaced apart relation; and a plurality of pieces of networkindividually extending inwardly toward said shaft between each twoadjacent sup porting blades from the outer ends of said supportingmembers and having the ends of each piece of network secured to theouter ends of the pair of supporting blades between which it is located.

5. A concrete mixer for making light concrete, including the combinationof a hollow drum having an inlet port and an outlet port; a shaftrotatably supported transversely in the drum; a plurality of widesupporting blades rigidly projecting radially from the shaft inangularly spaced apart relation; and a single piece of networksurrounding all of the supporting blades and extending inwardly towardsaid shaft between each two adjacent supporting blades from the outerends of said supporting members and being secured to said outer ends.

MATTI J AN HUNEN'.

REFERENCES CITED The following references are of record in the file ofthis patent:

UNITED STATES PATENTS Number Name Date 129,359 Moore July 16, 187233%,798 Moran Jan. 26, 1886 583,751 James June 1, 1897 592,708 Howe Oct.28, 1897

